Plas Newydd Marine Source Heat pump working. Press Tsunami of interest

Carl the BBC cameraman filming with Rodger Harabin. The Bangor University SEACAMS survey boat in the background kindly supplied for the day;s filmin. Carl is not walking on water but is standing on the  marine pipes for the sea pump.

Carl the BBC cameraman filming with Rodger Harabin. The Bangor University SEACAMS survey boat in the background kindly supplied for the day’s filming. Carl is not walking on water but is standing on the marine pipes for the sea pump.

Its been a full-on couple of days with the media. Paul and I spent today with Rodger Harrabin from the BBC filming the marine source heat pump for todays BBC News and Today Program. We have also pre recorded for BBC Wales Today, S4C News, BBC Radio Cymru, BBC Radio Wales and this morning (very very early this morning!) BBC Radio Scotland, BBC 5 Live, BBC West Midlands and also Live follow ups with BBC Wales and Radio Cymru. 3 Reporters are also spending the day at Plas Newydd. Paul did a big piece of the regional paper the Daily Post. Oh and we are being filmed as part of the upcoming Griff Rees-Jones series on the National Trust in Wales for BBC4. Other than that the completed Marine Source heat pump has not had any interest at all!!! As Paul keeps saying i have a face for radio!

It did get very surreal during the day. I was photographing a film cameraman, who was filming a film cameraman who was filming Rodger Harabiin.

Pump house. It did get very surreal during the day. I was photographing a film cameraman (BBC4), who was filming a film cameraman (BBC News) who was filming Rodger Harrabin.

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5 Responses to Plas Newydd Marine Source Heat pump working. Press Tsunami of interest

  1. Lucy hale evans says:

    World domination next! No seriously , well done guys.

  2. Paul D says:

    Websearch on ( wkipedia carnots law )
    It is a lot of mathematics but it boils down to a simple equation :-
    The theoretical maximum efficiency of a heat pump is equal to Th/(Th-Tc) where Th and Tc are the hot and cold refrigerant temperatures in the pump expressed in degrees absolute. e.g.
    For Tc=5C and Th=60C, the efficiency equals (273+60)/(60-5)=333/55=6.05, or
    for Tc=5C and Th=30C, the efficiency equals (273+30)/(30-5)=303/25=12.1.
    The ratio is 12.1/6.05=2

    You use twice as much electricity to pump between 5C and 60C as you do to pump between 5C and 30C. The BBC said that the pumps pump to 55C but add another 5C for heat exchanger inefficiency and that is a hot refrigerant temperature of 60C.

    At a refrigerant hot temperature of 60C there is normally no saving against oil-fired heating.

    These pumps are normally rated at A7/(W35/30) for air-to-water heat pumps. What is the rated CoP (efficiency) and what is the CoP at the full heat load of the house? You will probably get the answer for real next winter and I think that you should be worried.

    • Keith Jones says:

      Thanks for the comment. We are fine with the performance. You are assuming a lot of steady state, not factoring a dynamic heat source inc certain seasonal factors, heat loss rates for the building. Then we get into buildings heat inertia charectaristics. Being open loop also means we can adjust the delta T by increasing the flow rate. (We won’t run out of sea)
      We also have 60 years of daily temp data from the Menai straits. We have run three comprehensive dynamic heat models of the site (and then tested the model with lowering the temp on the oil boiler when it was -12 for two weeks)to see if we could maintain comfort heating. we then went on to work on the risk heating zones with insulation and secondary glazing. All this means we are quite confident in hitting our target 3.4CoP. Currently at 4.4 with all pumping (glycol, sea water, hot water) sea temp is 12c at the moment. We have a delta T of 3.6. Let’s have a chat in March 2015. This is when we will know?! All the best and thanks again

  3. Pingback: Mae’n gweithio fel oergell o chwith | Camu i awyr agored Cymru

  4. Pingback: It works like a fridge in reverse | Step outdoors in Wales

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